<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <div class="loading">
    <span></span>
    <span></span>
    <span></span>
    <span></span>
    <span></span>
    
</div>
</body>
</html>
<style>
  .loading{
       width: 80px;
       height: 40px;
       margin: 0 auto;
       margin-top:100px;
   }
   .loading span{
       display: inline-block;
       width: 8px;
       height: 100%;
       border-radius: 4px;
       background: lightgreen;
       -webkit-animation: load 1s ease infinite;
   }
   @-webkit-keyframes load{
       0%,100%{
           height: 40px;
           background: lightgreen;
       }
       50%{
           height: 70px;
           margin: -15px 0;
           background: lightblue;
       }
   }
   .loading span:nth-child(2){
       -webkit-animation-delay:0.2s;
   }
   .loading span:nth-child(3){
       -webkit-animation-delay:0.4s;
   }
   .loading span:nth-child(4){
       -webkit-animation-delay:0.6s;
   }
   .loading span:nth-child(5){
       -webkit-animation-delay:0.8s;
   }
</style>